OMD902100 BSC6900 Hardware System ISSUE1.01.Print

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BSC6900 Hardware Systemwww.huawei.comCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :40-47pt :26-30pt: :FrutigerNext LT Medium : Arial

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Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-0BSC6900 is an important network element(NE) of Huawei Single RAN solution. Ita dopts the industry-leading multiple radio access technologies (RATs), IP transmission mode, and modular design. In addition, it is integrated with the functions of the UMTS RNC and GSM BSC, thus efficiently maintaining the trend of multi-RAT convergence in the mobile network.The BSC6900 can be flexibly configured as a BSC6900 GSM, BSC6900 UMTS, or BSC6900 GU as required in different networks.Page1ReferencesBSC6900 Technical Description BSC6900 Product Description BSC6900 Hardware Description


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-1Page2ObjectivesUpon completion of this course, you will be able to:Understand BSC6900 function and features Master BSC6900 hardware structure Detail the signal flows in BSC6900List the typical hardware configuration of BSC6900


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-2Page3ContentsSystem Description Hardware StructureSystem Signal Flow Typical Configuration


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-3Page4Location of the BSC6900The HUAWEI BSC6900 is a new generation GSM BSC product after BSC6000 and BSC6810


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-4The interfaces between the BSC6900 GSM and each NE in the GSM network are as follows: Um: the interface between the BTS and the MS Abis: the interface between the BSC6900 GSM and the BTS A: the interface between the BSC6900 GSM and the Mobile Switching Center (MSC) or Media Gateway (MGW) Gb: the interface between the BSC6900 GSM and the Serving GPRS Support Node (SGSN) The A, Um, and Gb interfaces are standard interfaces, through which equipment from different vendors can be interconnected. The BSC6900 GSM performs functions such as radio resource management, base station management, power control, and handover control.

Page5High Integration and Low CostSupports 3,072 TRXs in a single cabinet Supports the simultaneous activation of up to 12,288 PDCHsMaximum of traffic: 19,500 Erl; BHCA : 5,250,000


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-5The BSC6900 GSM in BM/TC separated mode or A over IP mode supports 3,072 TRXs in a single cabinet. It caters to the mobile network requirements for higher capacity with fewer sites, thus requiring less space in the equipment room and reducing the power consumption. In addition, the BSC6900 GSM supports the simultaneous activation of up to 12,288PDCHs, thus meeting the increasing requirements for packet service growth and saving the cost of packet equipment

Page6Features of the BSC6900 SystemHigh integration and low cost Easy configuration and convenient maintenanceAll-IP platform Smooth evolution for investment protectionWeb-based LMT


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-6The BSC6900 GSM has a small number of board types. In addition to transmission boards, the BSC6900 GSM cabinet accommodates boards such as network switching boards, signaling processing boards, and service processing boards. The simplification of board types reduces the maintenance cost. The interface boards and service boards, not bound together, are flexible in configuration and easy to maintain and expand. Based on its all-IP platform, the BSC6900 GSM betters the PS service performance. The Abis, A, and Gb interfaces support IP transmission, which provides sufficient bandwidth and saves transmission cost. The IP-based platform and interface meet the trend of flattened network and the requirements for network evolution. The BSC6900 GSM is compatible with the hardware of the BSC6000. Through software loading, the BSC6000 in the existing network can be upgraded to the BSC6900 GSM. The BSC6900 GSM can be upgraded to the BSC6900 GU through addition of the UMTS boards and software upgrade. This facilitates the deployment of a 3G network and protects the investment of the operator. Page7Flexible ConfigurationHardware ConfigurationBM/TC Separated ModeBM/TC Combined ModeA over IP Mode


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-7In BM/TC combined mode, the BSC is not configured with the TCS. The boards that implement the TC functions are inserted into the slots in the MPS or EPS. With the same capacity, less cabinets and less subracks are required in the BSC, thus increasing the hardware integration.When the BSC is located in a remote equipment room, it is configured in BM/TC separated mode. The BSC is configured with a separate TCS, which is located in the TCR on the MSC side. Thus, the transmission resources between the BSC and the MSC are saved.In A over IP mode, the BSC directly connects to the Huawei core network without using the TC, thus protecting the operator's investment and improving the voice quality due to the reduction of encoding and decoding. The A over IP mode meets the needs for network evolution.Page8BSC6900 Evolution PathsSW upgrade with Legacy HW + New HW (necessary) SW upgrade with Legacy HW + New HW (optional) 200920082006GBSS8.1/RAN10GBSS9.0/RAN11GBSS12.0/RAN12BSC6000BSC6810BSC6900 GSM OnlyBSC6900 UMTS OnlyBSC6900 Dual modeBSC6900 GSM OnlyBSC6900 UMTS OnlyBSC6900 Dual modeSW upgrade with Legacy HW + New HW (optional) SW upgrade with Legacy HW + New HW (necessary) Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-8The BSC6900 can be flexibly configured as a BSC6900 GSM, BSC6900 UMTS, or BSC6900 GU as requried in different networks. With the support of EDGE+, the BSC6900 GSM can be upgraded to the BSC6900 GU through additon of UMTS boards and software upgrade.Page9 Smooth evolution from BSC to RNC with software upgrade Reducing CAPEX by reusing hardware Dynamic capacity adjustment between 2G&3GDual Mode Design

GSM&UMTS co-cabinetSoftware UpgradeRNCRNCBSC

BSCBSCRNCRNCRNCBSCGSM&UMTS cabinetCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-9Page10Feature of BSC6900Co OAM

Unified CME : Simultaneous 2G/3G data configuration, correctness and efficiency guaranteed

Unified WEB LMT for maintenance: 2G/3G Maintenance more easy and intuitionisticCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-10Centralized OMC for GSM&UMTS, unified platform for network construction, 2G/3G network planning, performance evaluation and trouble shooting etc.Simplifying the network architecture, reducing co-ordination and maintenance effort, man power and OPEX Saving

Page11pTRAUpTRAU

IPUNI-BTSUNI-BSCCo-transmissionUDPIP/PPPIP SWRouterFPFPFP3G2G3G2GpTRAUpTRAUFPFPFPUDPIP/PPPIP SWRouterInterface boardFeature of BSC6900Co TRMCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-11With unified transport resource management, bandwidth can be shared by UMTS&GSM.

Page12UMTSGSM

VoicePS serviceService direction on UMTS/GSMHeavyLoadHeavyLoadHeavyLoadHeavyLoadUMTSGSMLoad control between UMTS/GSMLoad control by inter-RAT HO3G/2G cell load consideration make traffic load spread in UMTS&GSM evenly, networkusage efficiency improved3G/2G cell load consideration make it more accurate for the service direction, betterperformance achievedHuawei Lab SimulationFeature of BSC6900Co RRMCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-12The performance improvement value (>23%&1.4%) are based on Huawei simulation result.Page13ContentsSystem Description Hardware StructureSystem Signal Flow Typical Configuration


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-13Page14Contents Hardware Structure2.1 Cabinets2.2 Subracks2.3 Boards2.4 Cables


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-14Page15BSC6900 Cabinet The BSC6900 uses the standard N68E-22 cabinetThe N68E-22 cabinet is of two types, the single-door cabinet and the double-door cabinet

600mm2200mm800mm600mm2200mm800mmN68E-22 Cabinet (Single-door/Double-door)Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-15ItemSpecificationDimensions2,200 mm (height) x 600 mm (width) x 800 mm (depth)Height of the available space46 UWeightEmpty cabinet 100 kg Cabinet in full configuration 300 kg Rated input voltage-48 VInput voltage range-40 V to -57 VEMCMeets the requirements in ETSI EN300 386 Meets the requirements in Council directive 89/336/EEC Page16Components of the Cabinet Based on functions, cabinets are classified into the main processing rack (MPR), extended processing rack (EPR), and transcoder rack (TCR)

(1) Filler panel(2) Subrack(3) Air defense frame (4) Power distribution box (5) Cable rack(6) Rear cable troughCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-16MPROnly one MPR is configured in the BSC6900.EPRThe number of EPRs to be configured depends on the traffic volume, but only one EPR can be configured in the BSC6900. You can also choose not to configure an EPR.TCRThe number of TCRs to be configured depends on the traffic volume and the configuration modes of subracks. Up to two TCRs can be configured in the BSC6900. You can also choose not to configure a TCR.ComponentConfigurationPower Distribution BoxOnly one power distribution box is configured.SubrackThe MPR is configured with one main processing subrack (MPS) and depending on the traffic volume, zero to two extended processing subracks (EPSs) or transcoder subracks (TCSs). The EPR is configured with one to three EPSs or TCSs, depending on the traffic volume. The TCR is configured with one to three TCSs, depending on the traffic volume. Air Defense FrameTwo air defense frames are configured.Rear Cable TroughThree rear cable troughs are configured.Page17Components of the Cabinet 1 EPS0 MPS2 EPSPOWER BOXMPR43 EPS5POWER BOXEPR7 TCS6 TCS8 TCSPOWER BOXTCRCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-17MPROnly one MPR is configured in the BSC6900.EPRThe number of EPRs to be configured depends on the traffic volume, but only one EPR can be configured in the BSC6900. You can also choose not to configure an EPR.TCRThe number of TCRs to be configured depends on the traffic volume and the configuration modes of subracks. Up to two TCRs can be configured in the BSC6900. You can also choose not to configure a TCR.ComponentConfigurationPower Distribution BoxOnly one power distribution box is configured.SubrackThe MPR is configured with one main processing subrack (MPS) and depending on the traffic volume, zero to two extended processing subracks (EPSs) or transcoder subracks (TCSs). The EPR is configured with one to three EPSs or TCSs, depending on the traffic volume. The TCR is configured with one to three TCSs, depending on the traffic volume. Air Defense FrameTwo air defense frames are configured.Rear Cable TroughThree rear cable troughs are configured.Page18Power Distribution Box subrack1subrack0subrack2POWER BOXsubrack0

(1) PAMU (2) Power distribution switches (3) Label for power distribution switches Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-18

Page19Contents Hardware Structure2.1 Cabinets2.2 Subracks2.3 Boards2.4 Cables


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-19Page20Subrack (1) Fan box(2) Mounting ear(3) Guide rail(4) Front cable trough(5) Boards(6) Grounding screw(7) DC power input port(8) Port for the monitoring signal cable of the power distribution box(9) Cover plate of the DIP switch

500mm436mm12UCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-20The main components of the subrack are the fan box, slots, front cable trough, and backplane.Specification:In compliance with the IEC60297 standard, each subrack is 19 inches in width and 12 U in height. 1U=44.45mm=1.75inch.Weight of Empty subrack: 25 kg; Weight of subrack configured with boards: 57 kgThe DIP switch with 8 bits on the subrack is used to set the number of the subrack.

Page21Dip Switch on the SubrackSubrack No.Bit12345678000000ON ON OFF ON ON ON ON ON 110000OFFONOFFOFFONONONON201000OFFONOFFONOFFONONON311000ONONOFFOFFOFFONONON400100OFFONOFFONONOFFONON510100ONONOFFOFFONOFFONONThe DIP switch on the subrack has eight bits from 1 to 8Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-21As the DIP switch uses odd parity check, the number of 1s in the eight bits must be an odd number. The method for setting the bits is as follows: Set bits 1 through 5 and bit 8.Set bit 7 to ON.Check the number of 1s in the bits of the DIP switch. If the number of 1s is even, set bit 6 to OFF.If the number of 1s is odd, set bit 6 to ON.

BitDescription1-5Bits 1 to 5 are used for setting the subrack number. Bit 1 is the least significant bit. If the bit is set to ON, it indicates 0. If the bit is set to OFF, it indicates 1.6Odd parity check bit7Reserved, undefined, generally set to ON8Bit 8 is used to set the startup mode of the SCUa board. The description of this bit is as follows: When this bit is set to ON, the SCUa board is not in auto-startup mode. In this case, the SCUa board must be started by the loading from the OMUa board. When this bit is set to OFF, the SCUa board is in auto-startup mode. In this case, the SCUa board checks the validity of the Flash file before it is started. If the Flash file is valid, the SCUa board is started by the loading from the Flash memory. Otherwise, the SCUa board is started by the loading from the OMUa board.Bit 8 is set to OFF for the BSC6900.Page22Slots in the Subrack (1) Front slot(2) Backplane(3) Rear slotthe boards are installed on both the front and rear sides of the backplane


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-22Each subrack provides a total of 28 slots. The 14 slots on the front side of the backplane are numbered from 00 to 13, and those on the rear side from 14 to 27.Two neighboring slots, such as slot 00 and slot 01 or slot 02 and slot 03, can be configured as a pair of active/standby slots. A pair of active and standby boards must be installed in a pair of active and standby slots.Page23Main Processing Subrack (MPS)The MPS processes the basic services and performs the O&M function. In addition, the MPS provides clock for the systemAs the main processing subrack, the MPS is configured in the MPR. Only one MPS is configured in the BSC6900Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-23Page24Main Processing Subrack (MPS)BSC6900 must have only one MPS

Front BoardRear BoardCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-24Every board in MPS occupies 1 slot except OMU board which occupied 2 lots.In BM/TC combined configuration mode, the MPS must be configured with the OMUa board, TNUa board, SCUa board, GCUa board, XPUa board, DPUc board, and DPUd board. The EIUa board, OIUa board, GOUa board, and FG2a/PEUa board are optional boards. The INT board (interface board) can be the PEUa board, EIUa board, OIUa board, FG2a board, or GOUa board Page25Extended Processing Subrack (EPS)As the extended processing subrack, the EPS is configured in the MPR or EPR. It processes the basic services of the BSC6900Compared with the MPS, the EPS is not configured with the GCUa and OMUaCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-25Page26Extended Processing Subrack (EPS)Front BoardRear Board

BSC6900 has no EPS or up to 4 EPS for GSMCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-26In BM/TC separated configuration mode, the EPS must be configured with the TNUa board, SCUa board, XPUa board, and DPUd board. The DPUc board, GOUa board, EIUa/OIUa board, and PEUa/FG2a board are optional boards. In BM/TC combined configuration mode, the EPS must be configured with the TNUa board, SCUa board, XPUa board, DPUc board, and DPUd board. The EIUa board, OIUa board, and FG2a/PEUa board are optional boards.Note: The INT board (interface board) can be the PEUa board, EIUa board, OIUa board, FG2a board, or GOUa board.EPS has 14 slots in the front panel and another 14 slots in the back panel.The differences between MPS and EPS follow:No GCU board,no OMU board in EPS.Slot 0-5 are fixed for the SPU board,slot 6,7 are fixed for SCU,slot 12,13 are fixed for DPU board,slot 20-23 are fixed for OMU board,slot 20-27 are fixed for Interface boardPage27TransCoder Subrack (TCS)The TCS is the transcoder subrack. In BM/TC separated configuration mode, the TCS is configured in the MPR, EPR, or TCRIt performs transcoding, rate adptation, and sub-multiplexingCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-27Page28TransCoder Subrack (TCS)Front BoardRear Board

BSC6900 has up to 4 TCS for GSMCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-28Page29Contents Hardware Structure2.1 Cabinets2.2 Subracks2.3 Boards2.4 Cables


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-29Page30BSC6900 Logical StructureLMT/M2000Clock Synchronization Subsystem Switching Subsystem Interface Processing Subsystem Service Processing SubsystemOM SubsystemTo BTSTo MSCTo other BSCTo SGSNClock (optional)Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-30Besides, the BSC6900 has the power subsystem and environment monitoring subsystem.

Page31Switching SubsystemThe switching subsystem performs the following functionsProvides intra-subrack Medium Access Control (MAC) switching Provides intra-subrack Time Division Multiplexing (TDM) switching Provides switching channels for traffic data Provides OM channels Distributes clock signals to the service processing boards Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-31The switching subsystem consists of the SCUa boards, TNUa boards, high-speed backplane channels in each subrack, crossover cables between SCUa boards, and inter-TNUa cables Page32Switching Subsystem (Cont.)


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-32The switching subsystem consists of two types of logical modules: MAC switching and TDM switching. It show the position of the switching subsystem in the overall structure of the system, with the modules highlighted in apricot.Page33Network Topologies Between SubracksMAC switching - star topology One node functions as the center node and it is connected to each of the other nodes. The communication between the other nodes must be switched by the center nodeTDM switching - mesh topologyThere is a connection between every two nodes. When any node is out of service, the communication between other nodes is not affectedCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-33In the switching subsystem of the BSC6900, the star topology is established among the MAC switching logical modules, and the mesh topology is established among the TDM switching logical modules.Page34TNUa BoardThe TNUa board performs the following functions:Provides 128 k * 128 k TDM switching Allocates the TDM network resources Only supports GSM


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-34The TNUa board provides the TDM switching and serves as the switching center for the CS services of the entire system.Port NameFunctionType10/100/1000BASE-TFor inter-subrack connectionRJ45COMSerial port for commissioningRJ45CLKINReceiving the 8 kHz and the 1PPS timing signals from the GCUa/GCGaRJ45TESTOUTTest the timing signal output SMB malePage35SCUa BoardThe SCUa board performs the following functions:Provides the maintenance management function Provides configuration and maintenance of a subrack or of the entire BSC6900 Monitors the power supply, fans, and environment of the cabinet Enables inter-subrack connections Supports GSM&UMTS


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-35The SCUa board provides the maintenance management and GE switching platform for the subrack in which it is located. Thus, the BSC6900 internal MAC switching is implemented and the internal switching in turn enables complete connection between all modules of the BSC6900.

Port NameFunctionType10/100/1000BASE-TFor inter-subrack connectionRJ45COMSerial port for commissioningRJ45CLKINReceiving the 8 kHz and the 1PPS timing signals from the GCUa/GCGaRJ45TESTOUTTest the timing signal output SMB malePage36Service Processing SubsystemThe service processing subsystem performs the following functionsRadio resource management and control Radio access management Cell broadcast service control CS service processing PS service processing Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-36Service processing subsystems can be increased as required according to the linear superposition principle. Thus, the service processing capability of the BSC6900 is expanded.Service processing subsystems communicate with each other through the switching subsystem to form a resource pool and perform tasks cooperatively.Page37Service Processing Subsystem


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-37The service processing subsystem mainly consists of two logical modules: BSC control plane (CP) and BSC user plane (UP). Figure shows the position of the service processing subsystem in the overall structure of the system, with the modules highlighted in apricot

Page38XPUa BoardThe XPUa board performs the following functions:There are four logical processing units inside a XPUa board. It only supports GSM.Main Processing Unit (MPU): manage the user panel resources, signaling panel resources, and the DSP status of the subrack Signaling Processing Unit (SPU): process the signalingFor GSM Only mode, normally one MPU is enough.


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-38Port NameFunctionType10/100/1000BASE-T0 to 10/100/1000BASE-T310M/100M/1000M Ethernet portsRJ45Page39XPUb BoardThe XPUb board performs the following functions:There are eight logical processing units inside a XPUb board. So its processing capability improves 75%-100% more than XPUa. It only supports GSM.Main Processing Unit (MPU): manage the user panel resources, signaling panel resources, and the DSP status of the subrack Signaling Processing Unit (SPU): process the signalingFor GSM Only mode, normally one MPU is enough.


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-39Port NameFunctionType10/100/1000BASE-T0 to 10/100/1000BASE-T310M/100M/1000M Ethernet portsRJ45Page40SPUa/SPUb BoardThe SPUa/SPUb board performs the following functions:The SPUa/SPUb support both GSM and UMTS. There are four/eight logical units inside a SPUa/SPUb board. The processing capability of SPUb improves 75%-100% more than SPUa .For GSM Only mode, normally one MPU is enough. For GU mode, we need to configure more MPUs.


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-40Port NameFunctionType10/100/1000BASE-T0 to 10/100/1000BASE-T310M/100M/1000M Ethernet portsRJ45Page41DPUc BoardThe DPUc board performs the following functions:Provides the speech format conversion and data forwarding functions Encodes and decodes voice services Provides the Tandem Free Operation (TFO) functionProvides the voice enhancement functionDetects voice faults automaticallyOnly supports GSM


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-41Page42DPUd BoardThe DPUd board performs the following functions:Processes the PS services on up to 1,024 simultaneously active PDCHs where signals are coded in MCS9Processes packet linksDetects packet faults automaticallyOnly supports GSM


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-42Page43DPUb BoardThe DPUb board performs the following functions:Provides the speech format conversion and data forwarding functions Encodes and decodes voice services Provides the Tandem Free Operation (TFO) functionPerforms the functions of the GTP-U, IUUP, PDCP, RLC, MAC, and FP protocolsProvides the voice enhancement functionSupports GSM and UMTS


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-43Page44Clock Synchronization SubsystemINTINTSCUaINTINTSCUaSCUaGCUa

Clock moduleMPS8kHzTo BTSEPSEPS8KHz19.44MHz, 32.768MHz,8kHzClock cableHigh-speed backplane channel CN BITSGPSTo BTSTo BTS19.44MHz, 32.768MHz,8kHz19.44MHz, 32.768MHz,8kHzCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-44The clock synchronization subsystem can provide the following clock sources: Building Integrated Timing Supply System (BITS) clock, Global Positioning System (GPS) clock, LINE clock, and external 8 kHz clock. It ensures the reliability of the clock signals. The BSC6900 provides reference clock sources for base stations. Clock signals are transmitted from the BSC6900 to base stations over the Iub interface. The clock synchronization subsystem provides clock signals for the BSC6900, generates the RNC Frame Number (RFN), and provides reference clock signals for base stations. The position of the clock synchronization subsystem in the overall structure of the system.Page45GCUa/GCGa BoardThe GCUa/GCGa board performs the following functions:Traces, generates, and maintains the synchronization clock The standby GCUa board traces the clock phase of the active GCUa board. This ensures the smooth output of the clock phase in the case of active/standby switchover The GPS antenna port on the GCGa board is used to receive the timing signals and positioning information from the GPS satellite. This port is not used on the GCUa board.Both support GSM&UMTS


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-45Page46Interface Processing SubsystemBoard TypeTransport ModePort TypeBoardINTTDMElectrical portEIUaOptical portOIUaIPElectrical portFE/GEFG2a/FG2cE1PEUaOptical portSTM-1POUcGEGOUa/GOUcInterface board categorySupport ModeGSM OnlyGSM&UMTSGSM&UMTSGSM&UMTSGSM&UMTSGSM&UMTSCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-46Page47EIUa BoardThe EIUa board performs the following functions:Transmits, receives, encodes, and decodes 32 E1s/T1sProcesses signals according to the LAPD protocol, SS7 MTP2 protocol Provides the Tributary Protect Switch (TPS) function between the active and standby EIUa boards Provides the OM links when the TCS is configured on the MSC side Supports the A, Abis, Pb and Ater interfaces


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-47Page48OIUa BoardThe OIUa board performs the following functions:Provides one STM-1 port for TDM transmission with the rate of 155.52 Mbit/s Processes signals according to the LAPD protocol, SS7 MTP2 protocol Provides the Automatic Protection Switching (APS) function between the active and standby OIUa boards Provides the OM links when the TCS is configured on the MSC side Supports the A, Abis, Pb and Ater interfaces


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-48Page49FG2a BoardThe FG2a board performs the following functions:Provides 8 channels over FE ports or 2 channels over GE electrical ports Provides the routing-based backup and load sharing Supports the Abis, A, and Gb interfaces


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-49As an interface board, the FG2a board supports IP over Ethernet transmission PortFunctionConnector Type10/100BASE-T10M/100M Ethernet ports, used to transmit 10/100M signalsRJ4510/100/1000BASE-T10M/100M/1000M Ethernet ports, used to transmit 10/100/1000M signalsRJ452M0 and 2M1Not used in RNCSMB male connectorPage50FG2c BoardThe FG2c board performs the following functions:Provides 12 channels over FE ports or 4 channels over GE electrical ports Provides the routing-based backup and load sharing Supports the Abis, A, and Gb interfaces

10M/100M/1000M 10M/100MCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-50As an interface board, the FG2c board supports IP over Ethernet transmission PortFunctionConnector Type10/100BASE-T10M/100M Ethernet ports, used to transmit 10/100M signalsRJ4510/100/1000BASE-T10M/100M/1000M Ethernet ports, used to transmit 10/100/1000M signalsRJ452M0 and 2M1Not used in RNCSMB male connectorPage51PEUa BoardThe PEUa board performs the following functions:Provides 32 channels of E1s/T1s for HDLC transmissionProvides the Tributary Protect Switch (TPS) function between the active and standby PEUa boardsTransmits, receives, encodes, and decodes 32 channels of E1s/T1s. The E1 transmission rate is 2.048 Mbit/s; the T1 transmission rate is 1.544 Mbit/s.Supports the Abis and Gb interfaces


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-51Ports on the PEUa Board PortFunctionConnector TypeE1/T1 (0-7)E1/T1 port, used to transmit and receive E1/T1 signals on channels 0-7DB44E1/T1 (8-15)E1/T1 port, used to transmit and receive E1/T1 signals on channels 8-15DB44E1/T1 (16-23)E1/T1 port, used to transmit and receive E1/T1 signals on channels 16-23DB44E1/T1 (24-31)E1/T1 port, used to transmit and receive E1/T1 signals on channels 24-31DB442M0 and 2M1Output ports for clock signals. These ports are used to transmit the 2 MHz line clock signals to the GCUa/GCGa board. The clock signals are extracted from upper-level devices and serve as the clock sources of the BSC6900 system.SMB male Page52POUc Board The POUc board performs the following functions:Provides 4 channels over channelized optical STM-1/OC-3 ports based on IP protocol Supports the PPP function Extracts line clock signals Provides the Automatic Protection Switching (APS) function between the active and standby POUc boards Supports the A, Abis, Gb, Ater interfaces


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-52Ports on the POUc Board PortFunctionConnector TypeRXOptical port, used to transmit and receive optical signals. TX refers to the transmitting optical port, and RX refers to the receiving optical port.LC/PCTX2M0 and 2M1Output ports for clock signals. These ports are used to transmit the 2 MHz line clock signals to the GCUa/GCGa board. The clock signals are extracted from upper-level devices and serve as the clock sources of the BSC6900 system.SMB male connectorPage53GOUa Board The GOUa board performs the following functions:Provides 2 channels over GE optical ports for IP transmissionProvides the Tributary Protect Switch (TPS) function between the active and standby boards Supports the Abis and A interfaces


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-53Ports on the GOUc board PortFunctionConnector TypeRXOptical port, used to transmit and receive optical signals. TX refers to the transmitting optical port, and RX refers to the receiving optical port.LC/PCTX2M0 and 2M1Not used in RNCSMB male connectorPage54GOUc Board The GOUc board performs the following functions:Provides four channels over GE optical ports Provides the routing-based backup and load sharing Extracts line clock signals Supports the Abis, A, and Gb interfaces


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-54Ports on the GOUc board PortFunctionConnector TypeRXOptical port, used to transmit and receive optical signals. TX refers to the transmitting optical port, and RX refers to the receiving optical port.LC/PCTX2M0 and 2M1Not used in RNCSMB male connectorPage55OM SubsystemSCUaSCUaHUB

OMUaOMUaSCUaSCUaAlarm boxLMT External network MPS To M2000Internal network EPS Internet cable serial cable Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-55The OM subsystem enables the management and maintenance of the BSC6900 in the following scenarios: routine maintenance, emergency maintenance, upgrade, and capacity expansion Page56OMUa BoardOMUa board is the Back Administration Module (BAM) of the BSC6900, it performs the following functions :Configuration management, performance management, fault management, security management, and loading management functions for the system Providing with the operation and maintenance interface for the LMT/M2000 users


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-56Ports on the OMUa Board

(1) Captive screw (2) Ejector lever (3) Self-locking latch (4) RUN LED (5) ALM LED (6) ACT LED (7) RESET Button (8) SHUTDOWN Button (9) USB port (10) ETH0 Ethernet port (11) ETH1 Ethernet port (12) ETH2 Ethernet port (13) COM port (14) VGA port (15) HD LEDs (16) OFFLINE LED (17) Hard disks (18) Screws for fixing the hard disk PortFunctionConnector TypeUSB0-1 and USB2-3USB ports. These ports are used to connect USB devices.ETH0 to ETH2GE ports.RJ45COM-ALM/COM-BMCSerial port. This port is used for system commissioning or for common serial port usage.DB-9VGAMonitor portPage57Contents Hardware Structure2.1 Cabinets2.2 Subracks2.3 Boards2.4 Cables


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-57Page58Main CablesTrunk Cables75 coaxial cable and Active/Standby 75-ohm coaxial cable120 twisted pair cable and Active/Standby 120 twisted pair cableNetwork cablesOptical FibersY-Shaped Clock CablePDB Monitoring Signal CableCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-58Page59Trunk Cables75-ohm Coaxial Cable /120-ohm Twisted Pair Cable

(1) DB44 connector(2) Main label (Identifying the code, version, and manufacturer information of the cable)(3) Label (Identifying a coaxial cable/twisted pair cable)(4) Metal case of the DB44 connectorCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-59The 75-ohm coaxial cable is a type of trunk cable. It is optional. The number of 75-ohm coaxial cables to be installed depends on site requirements. This cable connects the active/standby AEUa/PEUa board to the Digital Distribution Frame (DDF) or other NEs and transmits E1 trunk signals.The 75-ohm coaxial cable used in the BSC6900 has 2 x 8 cores. That is, the 75-ohm coaxial cable is composed of two cables, each of which contains eight micro coaxial cables. All of the 16 micro coaxial cables form eight E1 RX/TX links.The 75-ohm coaxial cable has a DB44 connector at only one end. You need to make a connector at the other end as required on site. The 120-ohm twisted pair cable is a type of trunk cable. It is optional. The number of 120-ohm twisted pair cables to be installed depends on site requirements. This cable connects the active/standby AEUa/PEUa board to the DDF or other NEs and transmits E1 signals. The 120-ohm twisted pair cable has a DB44 connector at only one end. You need to make a connector at the other end as required on site. Page60Trunk Cables (Cont.)Active/Standby 75-ohm Coaxial Cable

(1) DB44 connector(2) Metal case of the DB44 connector(3) Label (Identifying a coaxial cable)(4) Main label (identifying the code, version, and manufacturer information of the cable)(5) Label 2 (identifying a coaxial cable)Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-60The active/standby 75-ohm coaxial cable has two DB44 connectors at only one end. You need to make connectors at the other end as required on site.

Page61Trunk Cables (Cont.)Active/Standby 120-ohm Twisted Pair Cable

(1) DB44 connector(2) Metal case of the DB44 connector(3) Label 1 (identifying a twisted pair cable)(4) Main label (identifying the code, version, and manufacturer information of the cable)(5) Label 2 (identifying a twisted pair cable)Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-61The 120-ohm twisted pair cable has a DB44 connector at only one end. You need to make a connector at the other end as required on site.

Page62Ethernet CableStraight-Through Cable


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-62The straight-through cable is of two types: the shielded straight-through cable and the unshielded straight-through cable. The unshielded straight-through cable is used to connect the SCUa boards in different subracks.

The shielded straight-through cable is used to connect the FG2a/OMUa/FG2c board to other devices. The number of straight-through cables to be installed depends on the site requirements.

Page63Optical CablesOptical cables are used to connect the optical interface board to the Optical Distribution Frame (ODF) or other NEs.


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-63The optical cable has an LC/PC connector at one end connected to the optical interface board in the BSC6900. The other end of the optical cable can use an LC/PC connector, SC/PC connector, or FC/PC connector.

Page64Y-Shaped Clock CableThis cable transmits the 8 kHz clock signals from the GCUa/GCGa board in the MPS to the SCUa board in the EPS.

(1) Label (identifying a pair of twisted pair cables)(2) RJ45 connector Copyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-64When the straight-through cable is used to connect the SCUa boards of different subracks, the two ends of the cable are connected to the SCUa boards which are located in different subracks.When the straight-through cable is used to connect the OMUa board to the LAN of the customer, the RJ45 connector at one end of the cable is connected to the ETH0 or the ETH1 port on the OMUa board, and the RJ45 connector at the other end of the cable is connected to the Ethernet port of the LAN of the customer.

Page65PDB Monitoring Signal Cable The power distribution box (PDB) monitoring signal cable is used to transmit monitoring signals from the PDB to the subracks.


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-65The DB15 connector at one end of the PDB monitoring signal cable is connected to the port on the PDB for the service subrack. The DB9 connector at the other end of the cable is connected to the MONITOR port on the metal shielding board of the lowest subrack in the cabinet.

Page66ContentsSystem Description Hardware StructureSystem Signal Flow Typical Configuration


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-66Page67BSC6900 Signal FlowsUser-Plane Signal FlowGSM CS Signal Flow GSM PS Signal FlowControl-Plane Signal FlowSignaling Flow on the A Interface Signaling Flow on the Abis Interface Signaling Flow on the Gb InterfaceCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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Course NameConfidential Information of Huawei. No Spreading Without Permission P-67Page68GSM CS Signal Flow Abis over TDM and A over TDM


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-68the CS signal flow on the uplink is as follows: The uplink CS signals are sent from the BTS to the Abis interface board in the MPS/EPS. The CS signals are demultiplexed in the Abis interface board. Each CS signal uses a 64 kbit/s timeslot and is transmitted to the Ater interface board through the TNUa board. The CS signals are multiplexed in the Ater interface board. Each full-rate CS signal uses a 16 kbit/s sub-timeslot, and each half-rate CS signal uses an 8 kbit/s sub-timeslot. The CS signals are then transmitted to the Ater interface board in the TCS over the Ater interface. The CS signals are demultiplexed in the Ater interface board of the TCS. Each CS signal uses a 64 kbit/s timeslot and is transmitted to the DPUc board through the TNUa board. The DPUc board performs speech codec and rate adaptation on the CS signals, which are converted into 64 kbit/s PCM signals. The 64 kbit/s PCM signals are transmitted to the A interface board through the TNUa board and then to the MSC over the A interface.

Page69GSM CS Signal Flow Abis over HDLC/IP and A over TDM


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-69the CS signal flow on the uplink is as follows: The uplink CS signals are sent from the BTS to the Abis interface board in the MPS/EPS. The CS signals are transmitted from the Abis interface board to the DPUc board through the SCUa board. The DPUc board reorders PTRAU frames, eliminates jitter, and converts PTRAU frames into TRAU frames. Then, the TRAU frames are transmitted to the Ater interface board through the TNUa board. The CS signals are multiplexed in the Ater interface board in the MPS/EPS, and then are transmitted to the Ater interface board in the TCS. The CS signals are demultiplexed in the Ater interface board of the TCS. Each CS signal uses a 64 kbit/s timeslot and is transmitted to the DPUc board through the TNUa board. The DPUc board performs speech codec and rate adaptation on the CS signals, which are converted into 64 kbit/s PCM signals. The 64 kbit/s PCM signals are transmitted to the A interface board through the TNUa board and then to the MSC over the A interface. Page70GSM CS Signal Flow Abis over HDLC/IP and A over IP


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-70the CS signal flow on the uplink is as follows: The uplink CS signals are sent from the BTS to the Abis interface board in the MPS/EPS. The Abis interface board encapsulates the CS signals in PTRAU frames, which are then transmitted to the DPUc board through the SCUa board. The DPUc board converts PTRAU frames into RTP frames, reorders RTP frames, and eliminates jitter. The SCUa board transmits the CS signals to the A interface board, and then the A interface board transmits the signals to the MGW over the A interface. Page71GSM PS Signal Flow Abis over TDM


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-71the PS signal flow on the uplink is as follows: The packet data is sent from the BTS to the Abis interface board in the MPS/EPS. The data uses one to four 16 kbit/s sub-timeslots on the Abis interface, depending on the modulation and coding scheme, for example, CS1-CS4 or MCS1-MCS9. The Abis interface board transmits the packet data to the TNUa board, which then transmits the data to the DPUd board. The DPUd board converts the frame format and then transmits the data to the Gb interface board through the SCUa board. The Gb interface board processes the packet data according to the IP or FR protocol and then transmits it to the SGSN over the Gb interface. Page72Signaling Flow on the A Interface A over TDM


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-72the uplink signaling flow on the A interface is as follows: In the MPS/EPS, the signaling processing board processes the signaling according to the MTP3, SCCP, and BSSAP protocols. Then, the signaling is transmitted to the Ater interface board through the SCUa board. The Ater interface board processes the signaling according to the MTP2 protocol. Then, the signaling is transmitted to the Ater interface board in the TCS. In the TCS, the Ater interface board transparently transmits the signaling to the TNUa board and then to the A interface board. Then, the signaling is transmitted to the MSC over the A interface. Page73Signaling Flow on the A Interface A over IP


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-73the uplink signaling flow on the A interface is as follows: In the MPS/EPS, the signaling processing board processes the signaling according to the BSSAP, SCCP, SCTP, and M3UA protocols. Then, the signaling is transmitted to the A interface board through the SCUa board. The A interface board processes the signaling according to the IP protocol. Then, the signaling is transmitted to the MSC server through the MGW. Page74Signaling Flow on the Abis InterfaceAbis over TDM/IP/HDLC


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-74the uplink signaling flow on the Abis interface is as follows: The signaling is transmitted to the Abis interface board in the MPS/EPS over the Abis interface and then transmitted to the SCUa board. The SCUa board transmits the signaling to the signaling processing board. Page75Signaling Flow on the Gb Interface Gb over IP/HDLC


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-75the uplink signaling flow on the Gb interface is as follows: In the MPS/EPS, the signaling processing board processes the signaling according to the NS and BSSGP protocols. Then, the signaling is transmitted to the Gb interface board through the SCUa board. The Gb interface board processes the signaling according to the IP or FR protocol. Then, the signaling is transmitted to the SGSN over the Gb interface. Page76ContentsSystem Description Hardware StructureSystem Signal Flow Typical Configuration


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-76Page77Typical Configuration of BSC6900Index1MPS+1TCSNumber of cabinets1BHCA(K)875TrafficErl3250TRX number512Number of active PDCHsMCS-92048Gb interface throughputMbps128When the R11 boards are configured in BM/TC Combined mode

MPSMPRCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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MPSMPR

EPS


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MPSMPR

EPS

EPSCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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EPRMPR

MPS

EPS

EPS


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-80Page81Typical Configuration of BSC6900Index1MPS+1TCSNumber of cabinets2BHCA(K)1750TrafficErl6500TRX number1024Number of active PDCHsMCS-94096Gb interface throughputMbps256When the R11 boards are configured in BM/TC separate mode

TCS

MPSMPRTCRCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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TCS

MPSMPRTCR

EPS

TCSCopyright 2009 Huawei Technologies Co., Ltd. All rights reserved. :32-35pt : R153 G0 B0 :FrutigerNext LT Medium : Arial

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TCS

MPSMPRTCR

EPS

TCS


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Course NameConfidential Information of Huawei. No Spreading Without Permission P-83INT

INT

INT

OMUa

OMUa

INT

INT

INT

INT

INT

14

27

26

25

24

23

22

21

20

19

18

17

16

15

Backplane

XPUa

XPUa

XPUa

XPUa

TNUa

TNUa

SCUa

SCUa

DPUd

DPUd

GCUa

GCUa

0

1

13

12

11

10

9

8

7

6

5

4

3

2

INT

INT

INT

INT

INT

INT

INT

INT

14

27

26

25

24

23

22

21

20

19

18

17

16

15

Backplane

XPUa

XPUa

XPUa

XPUa

TNUa

TNUa

SCUa

SCUa

DPUd

DPUd

DPUd

0

1

13

12

11

10

9

8

7

6

5

4

3

2

INT

INT

INT

INT

INT

INT

INT

INT

INT

INT

INT

INT

INT

INT

14

27

26

25

24

23

22

21

20

19

18

17

16

15

Backplane

TNUa

TNUa

SCUa

SCUa

DPUc

DPUc

DPUc

DPUc

DPUc

0

1

13

12

11

10

9

8

7

6

5

4

3

2

Documents

OMD902100 BSC6900 Hardware System ISSUE1.01.Print